Am 28.02.20 um 18:29 schrieb J. M:
Here's what I get:
sudo apt-get remove libgdal20
[sudo] password for jimi:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'libgdal20' is not installed, so not removed
That was expected, because apt-cache policy libgdal20 already told you
that it was not installed.
jimi@jimi-System-Product-Name:~$ dpkg -l | grep gdal
ii gdal-bin 3.0.2+dfsg-1~bionic2
amd64 Geospatial Data Abstraction Library -
Utility programs
ii gdal-data 3.0.2+dfsg-1~bionic2
all Geospatial Data Abstraction Library - Data
files
ii libgdal26 3.0.2+dfsg-1~bionic2
amd64 Geospatial Data Abstraction Library
ii python3-gdal 3.0.2+dfsg-1~bionic2
amd64 Python 3 bindings to the Geospatial Data
These are still GDAL 3.02 packages that you installed with the ubuntugis
PPA. Get rid of those, otherwise you will not get further.
I'm still not clear about what the ubuntugis PPA is needed for, or what
gdal even is..
GDAL is more or less the heartbeat of QGIS. Almost every operation uses
it. For some reason, you must use exactly the same GDAL version as the
QGIS package is compiled against. For bionic (without ubuntugis), this
is GDAL 2.2.3. The gdal-abi package is used to confirm that version.
With the Ubuntugis PPA, you have installed a newer version of GDAL
(3.0.2), and the packet manager does not downgrade it by itself (it does
not know about th specific QGIS requirements).
HTH,
Andre Joost
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